I just had my bathroom totally redone and the Toto wall hung toilet creaks when sitting on it! I only weight about 150# and it is supposed to hold up to 500#. I am nervous to use it. I texted the Contractor who said that the plumber said these are “finicky”. Unfortunately I have paid the contractor in full. Can anyone give me some advice? Is it possible to fix the creaking without tearing into the wall?